<template>
	<view>
		<!-- 自定义搜索组件 -->
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-vieww-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh+'px'}">
				<block v-for="(item,index) in cateList" :key="index">
					<view @click="activeChanged(index)" :class="['left-scroll-view-item',index=== active ? 'active' : '']" >{{item.cat_name}}</view>
				</block>
				

			</scroll-view>
			
			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
				<view v-for="(item2,index2) in cateList2" :key="index2" class="cate-lv2">
					<view class="cate-lv2-title">
						{{item2.cat_name}}
					</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>

			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				// 当前设备可用的高度
				wh:0,
				cateList:[],
				active:0,
				// 二级分类
				cateList2:[],
				scrollTop:0
			};
		},
		onLoad(){
			const sysInfo = uni.getWindowInfo()
			// console.log(sysInfo);
			this.wh = sysInfo.windowHeight
			
			this.getCateList()
		},
		methods:{
			// 获取分类列表数据
			async getCateList(){
				const {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status!==200)
				return uni.$showMsg()
				this.cateList = res.message
				
				// 为二级分类赋值
				this.cateList2 =  res.message[0].children
			},
			activeChanged(index){
				this.active= index
				this.cateList2 = this.cateList[index].children
				this.scrollTop = this.scrollTop===0?1:0
			},
			//跳转到商品列表页面
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid='+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}

</script>

<style lang="scss">
.scroll-vieww-container{
	display: flex;
	
	.left-scroll-view{
		width: 120px;
		
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
			
			&.active{
				background-color: #ffffff;
				position: relative;
				
				&::before {
					content:'  ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
}
.cate-lv2-title{
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
